JEEP CHEROKEE STARTER PROBLEM

1993 Jeep Cherokee • 120,000 miles

I have a 1993 Jeep Cherokee with a straight 6 cylinder, 4.0 Liter engine. I replaced the starter last summer. Everything seemed to be working fine, when 2 weeks ago the replacement starter went out. So I replaced it with another starter… that starter only lasted 5 days. What could be causing the starters to go bad so quickly?